Select ALL the statement(s) that is/are TRUE about ionic compounds. a. In general, ionic compounds have higher boiling points than molecular compounds.
b. In general, ionic compounds can dissociate and form ions in water.
c. NaCl(s) is an ionic compound and it is poor in conducting electricity when it is in solid state.
d. The overall charge of an ionic compound has to be zero. In general, ionic compounds have poor solubility in water.

a, b and c

Explanation:

A - Ionic compounds have ionic bonds which are far more stronger than the intermolecular forces in molecular (covalent) compounds, so more energy is required to break the bonds, this having a higher boiling point

B - when ionic compounds are placed in water, they are attracted to water due to its dipole nature, so the water molecules attract the positive and negative ions from the compound, breaking the ions apart in a process called dissociation

C - NaCl is an ionic compound as it consists of a metal (Na) and a non-metal (Cl) where Na loses an electron to form +1 ion and Cl gains that electron to form -1 ion. It is poor in conducting electricity when it is in the solid state as the ions are held in fixed positions and cannot move. They can only conduct electricity when molten or dissolved in solution as the ions are free to move around.

D - The first part of the sentence is right : The overall charge of an ionic compound has to be zero as the positive and negative ions are equal, which maintains its neutrality. In general, most compounds have good solubilty in water as water molecules are polar they can attract the positive and negative ions and break up the structure.

There are a few exceptions, for example ionic compounds that have highly polarising ions (are small and have a high charge) which water is unable to break apart the ions.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

c. orbital shape i hope this is correct